I should have said AIO mppt inputs.
An MPPT charge controller input is the same. Doesn't matter if you are referring to a stand alone Charge Controller like a Victron or an input on an AIO. The function is the same. To convert the variable PV panel output into a stable, voltage and current controlled battery charger.
30 panels, 10 strings of 3 into a combiner box with ONE output. Lets call this 12,000 watts.
NO, that is way to much unnecessary wiring & hardware. Typically, the panels are combined in series to maximize voltage and thus reduce current (which requires smaller, less expensive wire) and the number of strings that need to be combined. Many of the new AIO products accept up to 500V or even 600V and have at least 2 separate MPPT inputs per inverter. These are very flexible with regard to PV array arrangement.
Would you split the array or hook both mppt inputs of BOTH AIO's to the single output of the combiner box?
With 30 panels and 2 AIO's here a couple of scenarios.
In all cases, none of the arrays would be split between 2 inverters.
1) Assuming that each AIO has 2 separate inputs and a Max Voc to support 10 panels in series. 3 strings of 10 panels would be connected in series. One of the AIO's would have 2 strings attached, one to each of the separate MPPT inputs. The other string would be attached to the other AIO on MPPT input 1
2) Assuming the AIO's Max Voc will not support 10 panels in series. Then something like 6 series strings of 5 panels. Take 2 strings and combine them in parallel and connect them to MPPT input 1, and one string of 5 and connect that to the other MPPT input on AIO #1. Do the same for AIO #2.
3) Same as 2 but each AIO only has 1 MPPT input. Combine 3 strings in parallel for each of the 2 AIO's.
There are other combinations. Keep in mind that multiple MPPT inputs on a single AIO are usually separate so the number of panels in the string does not have to be the same on MPPT 1 as on MPPT 2. However, if 2 series strings are combined in parallel each string should have the same number of panels to keep the voltages equal.